I saw this idea in the February 2008 issue of Family Fun magazine, on page 89. It’s from an article on The Kids Concoctions Couple, John & Danita Thomas. We just got our first chance to try it this afternoon. A big hit, but messy!
Mix equal parts cornstarch and water, and color with food coloring. Paint on driveway or sidewalk with brushes, or spray onto sand or snow sculptures.
For more great ideas, check out Rocks in My Dryer.